Hi,
Other Amiga-compatible monitors that display all of the A1200's screenmodes are the Microvitec 1483 (these were a popular choice in the UK) or the Acorn AKF50 (which was just a rebranded Microvitec). You may find one on eBay, though I'm not sure on their availability outside Europe.
Microvitec still makes such monitors but as they're now a specialist item, expect to pay lots for a new one. See
Microvitec's web site for further details - the model in question is the Desk-Scan 1402.
- Ali